Wife:5'2", baseline 102lbs, now 124lbs at 24 weeks- good trajectory? which is riskier to kid- too much or too little weight gain?

Wt GAIN: Baseline weight for her height is at low end of normal bmi range. Her wt gain of 22lbs is slightly ahead of normal for 24 wks (ave wt gain for 24 wks is about 15 lbs). However, given her low starting wt, i wouldn't be concerned about the gain thus far and would expect her to only gain another 10-15 lbs for the rest of the pregnancy which would still put her in the normal range of 25-35 lbs total.